Are there any examples of using EQS without the blackboard or behaviour trees? Preferably in C++.
Have a look at the EQSTestingPawn
https://github.com/EpicGames/UnrealEngine/blob/76085d1106078d8988e4404391428252ba1eb9a7/Engine/Source/Runtime/AIModule/Private/EnvironmentQuery/EQSTestingPawn.cpp